Olympia has no permission system on GIVE. In the alpha test, I noted
this in the signup documentation, and asked players to refrain from
absurd strategies such as giving enemies 100 stone to prevent their
movement.

I neglected to make such an announcement for g1; my mistake.
Now, some players who have just noticed the lack of GIVE checking
insist that it's well within the scope of the rules to use GIVE
as a military option, despite the fact that I asked them not to.

(So much for my thinking that it is so clearly a gap in the permission
system and an abuse to use GIVE in this way that no reasonable gamer
would do so)

Anyway. What shall I do?

o Make an announcement that this use of GIVE is "against
the rules", and shouldn't be done?